Photographic copying apparatus



1966 J. F. HAYDEN ETAL PHOTOGRAPHIC COPYING APPARATUS '7 Sheets-Sheet 1Original Filed April 2, 1962 IIIII.

Winn

HAYDEN GLEN W OFFENSEND JAMES E INVENTORS 4 y ATTORNEYS Nov. 22, 1966 J.F. HAYDEN ETAL. 3,286,587

PHOTOGRAPHIC COPYING APPARATUS Original Filed April 2, 1962 '7Sheets-Sheet 2 JAMES F. 114mm GLEN w. OFFENSENO INVENTORS ATTORNEYS J.F. HAYDEN ETAL 3,286,587

PHOTOGRAPHIC COPYING APPARATUS 7 Sheets-Sheet 5 Nov. 22, 1966 OriginalFiled April 2, 1962 F HAYDEN JAMES GLEN W OFFENSE/VD INVENTORS BY /%%iATTORNEYS Nov. 22, 1966 J. F. HAYDEN ETAL PHOTOGRAPHI C COPY INC:APPARATUS Original Filed April 2, 1962 7 SheetsSheet A,

JAMES F HAYDEN GLEN WOFFENSE/VD INVENTORS BY div/262% ATTORNEYS 22, 1966J. F. HAYDEN ETAL 3,236,587

PHOTOGRAPHIC COPYING APPARATUS '7 Sheets-Sheet 5 Original Filed April 2Nov. 22, 1966 J. F. HA YDEN ETAL PHOTOGRAPHIC COPYING APPARATUS 7Sheets-Sheet 6 Original Filed April 2, 1962 JAMES E HAYDEN GLEN WOFFENSE/VD INVENTORS BY 7 fzw/wl fifz WW9 A TTORNEYS Nov. 22, 1966 F.HAYDEN ETAL 3,286,587

PHOTOGRAPHIC COPYING APPARATUS '7 Sheets-Sheet 7 Original Filed April 2,1962 JAMES F. HAYDEN GLEN W OFFENSE/VD INVENTORS BY WW9) ATTORNEYSUnited States Patent 3,286,587 PHOTOGRAPHIC COPYING APPARATUS James. F.Hayden and Glen W. Offensend, Rochester, N .Y., assignors to EastmanKodak Company, Rochester, N.Y., a corporation of New Jersey Originalapplication Apr. 2, 1962, Ser. No. 184,107, now Patent No. 3,253,503,dated May 31, 1966. Divided and this application Dec. 16, 1963, Ser. No.330,807 2 Claims. (Cl. 88-24) This invention relates to a photographicapparatus and more particularly to an apparatus for the photographiccopying of documents. This application is a division of our copendingapplication Serial No. 184,107 filed April 2, 1962, now Patent No.3,253,503.

The novel features which comprise the present invention were originallydevised for use in a photographic copying apparatus of the type whichcopies predetermined areas on documents which are fed successivelythrough a photographing station. Such a known apparatus is disclosed inUS. Patent 2,738,704, Hintz et -al., granted March 20, 1956. It shouldbe understood, however, that the invention which is disclosed anddescribed herein could be used in other apparatus with equal facilityand that its description with reference to the particular copyingapparatus herein disclosed has been made only to provide background tofacilitate the understanding of the invention.

While photographic copying apparatus of the type disclosed in U.S.Patent 2,738,704 is capable of copying documents at different opticalmagnifications, the changing from one to another magnification is atedious job which requires considerable operator skill to providecorrect optical alignment of the machine. Thu-s one aspect of thepresent invention is a device which simplifies the changing of theoptical magnification of the optical system in such a photographiccopying apparatus. Another aspect of the present invention is theprovision of an improved mechanism for controlling the advance of thephotographic recording media so that unexposed sections of recordingmedia are positioned to receive the projected images of successivedocuments. Still another aspect of the present invention is theprovision of a novel mechanism, operatively associated with the movementof the recording media, to adjust the size of the exposure aperture inthe exposure station to conform to the extent of movement which is.imparted to the recording media.

The primary object of the present invention is, therefor, to provide animproved photographic copying apparatus.

Another object of the present invention is to provide an improvedoptical projection system for a photographic copying apparatus.

Still another object of the present invention is to provide an improvedoptical projection system for a photographic copying apparatus which iscapable of varying the size of the document image projected therebywhile maintaining the projected image in focus on the photographicrecording media located in the exposure station of the apparatus.

Yet another object of the present invention is to provide an improvedmechanism for moving the photographic recording media in a photographiccopying apparatus in synchronism with the movements of documents throughthe photographing station of the apparatus.

Still another object of the present invention is to provide an improvedmechanism for advancing a photographic recording media intermittentlyand through a predetermined distance in synchronism with the movement ofdocuments through the photographing station of a photographic copyingapparatus.

Another object of the present invention is to provide, in a photographiccopying apparatus for copying variable width areas on documents bearingmeans for designating 3,286,587 Patented Nov. 22, 1966 the width of suchareas, an improved mechanism for moving the photographic recording mediain the exposure station of the apparatus in synchronism with themovement of documents through the photographing station of theapparatus, the extent of movement imparted to the recording mediacorresponding to the width of the area on the document being copied, andthe mechanism including means for preselecting the ratio of suchcorrespondence.

Still another object of the present invention is to provide a mechanism'which is operatively associated with the film advance mechanism of aphotographic copying apparatus, to adjust the size of the exposureaperture in accordance with the length of film which is advanced by thefilm advance mechanism.

Yet another object of the present invention is to pro vide, in aphotographic copying apparatus for copying variable width areas ondocuments bearing means for designating the width of such areas, animproved film advancing mechanism for moving a length of film into theexposure station of the copying apparatus, which length corresponds tothe width of the area on the document being copied, said mechanism beingoperatively associated with a mask for the exposure station and therebychanging the size of the exposure aperture of the exposure station tocorrespond to the length of film moved into the exposure station.

Still other objects and advantages of the present invention will becomereadily apparent to those skilled in the art from the followingdescription with reference to the drawings in which like charactersdenote like parts and wherein:

FIG. 1 is a side elevation view of a photographic copying apparatusshowing the film advance mechanism of the present invention;

FIG. 2 is a schematic illustration of the drive for film advancemechanism;

FIG. 3 is a schematic illustration of the present invention;

FIG. 4 is a side elevation view partly in section showing the opticalsystem of the present invention as it is incorporated in thephotographic copying apparatus;

FIG. 5 is an enlarged view showing the drive mechanism for the opticalsystem;

FIG. 6 is a top plan view of the optical system of FIG. 4, but showingthe elements as they are positioned to provide the greatest reduction inthe projected image size;

FIG. 7 is. a sectional view of the optical system taken along lines 7-7of FIG. 6; and

FIG. 8 is an elevation view taken in the direction indicated by thelines 8-8 of FIG. 4.

The frame of the photographic copying apparatus is designated by thenumeral 10. The numeral 11 designates a crank shaft which carriesdocument advancing means for feeding the documents to be photographedthrough the photographing station of the document copying apparatus. Thespecific mechanism by which this feeding movement of documents isaccomplished does not form a part of the present invention and can beany one of several which are well-known in the art such as, for example,the one disclosed in Hlintz et .al. US. Patent 2,738,704. Crank shaft 11is driven by motor 12 through worm 13 and worm gear 14, shaft 15, bevelgears 16 and 17, shaft 18 and bevel gears 1'9 and 20, see FIG. 2. Crankshaft 11 canries three individual cranks 21, 23, and 25 on three bearingsurfaces 22, 24, and 26, respectively, each surface being eccentric tothe others and being eccentric to the rotational axis of crank shaft 11.As is apparent from FIG. 2, the throw of crank 23 is greater than thatof 21, and the throw of crank 25 is grezated than that of crank 23. Thefunction of this construction will be hereinafter set forth. The cranksare piyotall'y connected to three similarly sized and shaped of theoptical system pawl arms 27, 29, and 31, respectively, by means of threesimilar connector pins, only one of which is shown at 33. The three pawlarms are pivotally mounted about pivot shaft 35. Pivot shaft 35 issupported on a pawl arm bracket 37 which, in turn, carries a nut 39 forreceiving the pawl pivot adjustment screw 41. The screw 41 is carried bythe pivot adjusting base 43 which is fixed on frame 10. Screw 41 isoperatively connected to suitable gearing contained within base 43 andis rotatably driven by the lgearing through flexible shaft 45 and anelectric motor, not shown, which drives the flexible shaft. The samemotor also drives the three flexible shafts designated 47, 49, and 51which are associated, as will be hereinafter set forth, with pawl arms27, 29, and 31 respectively. Each pawl arm includes a pivot adjustingscrew such as the one in pawl arm 31 designated by the numeral 53. Thepivot adjusting screws are threaded on a pivot adjusting slide like theone designated by the numeral 55 of pawl arm 31 and each slide isrotatably carried by pivot shaft 35. Each of the flexible shafts 47, 49,and 51 are connected by respective worms and worm gears to the pivotadjusting screws of pawl arms 27, 29, and 31 so that rotation of theflexible shafts is imparted to the pivot adjusting screws to therebymove the pivot adjusting slides either toward or away from the connectorpins which connect the pawl arms to the cranks. In other words, therotation of flexible shafts 47, 49, and 51 change the relative pivotpoint for the pawl arms 27, 29, and 31, respectively. The gears throughwhich flexible shafts 47, 49, and 51 are driven :are selected so thatpivot adjusting slides are all displaced the same amount in response toany rotation imparted by the motor to such shafts.

As was mentioned, the flexible shaft 45 is driven by the same motorwhich drives flexible shafts 47, 49, and 51. The drive of shaft 45 issimultaneous with the driving of shafts 47, 49, and 51 and the relativespeeds with which the four flexible shafts are driven is chosen throughthe gearing utilized so that the pawl arm bracket 37 will be moved inthe same direction that the pivot adjustment slides are moved relativeto the pawl arms and to an extent which is exactly equal to the distancetraversed by the pivot adjusting slides relative to the pawl arms. Thuseven though the pivot point for the pawl arms 27, 29, and 31 is changedthe ends of the pawl arms remain in the exact same vertical positionrelative to frame 10.

Three similarly sized and shaped film advance pawls designated 61, 63,and 65 are pivotally mounted by three studs 67, 69, and 71,respectively, on the ends of the pawl arms remote trom the cranks 21,23, and 25. The operating ends of the pawls are urged in a clockwisedirection about studs 67, 69, and 71 by means of tension springs 73, 75,and 77, respectively. The numeral 79 designates the film advance arm.This arm is mounted in the apparatus for pivotal movement about axis 81,which axis corresponds the axis of rotation of the drive roller 83, seeFIG. 4. Drive roller 83 positions the film strip F in the exposurestation of the apparatus as will be hereinafter described. The filmadvance arm 79 is connected to drive roller 83 by means of a one-wayclutch, not shown, so that angular rotation of the film advance arm in aclockwise direction with respect to axis 81 is imparted to the roller83, thereby moving the film F through contact with the periphery of theroller while pivotal movement of the arm in a counterclockwise directionabout axis 81 imparts no movement whatsoever to the roller 83. Theone-way clutch is of a well-known construction and can be any one ofseveral which are commercially available to the trade. The lower end ofthe film advance arm 79 carries a pawl pin 85 which is sufficiently longto engage and support the pawl arms 61, 63, and 65. Arm return spring 84resiliently urges arm 79 in a counterclockwise direction about a stud 99which is fixed in frame and are resiliently urged in a clockwisedirection relative to the stud 99 by means of a pair of tension springs111 and 11-3, respectively. A stop member 115 prevents rotation of pawlselector arms beyond a predetermined point. The end of the arm which isremote from the plunger 91 is positioned to engage the under surface offilm advance pawl 61 while the corresponding end of pawl selector arm'97 is disposed to engage the under surface of film advance pawl 63. Thefunction served by the pawl selector solenoids and the associated arms95 and 97 is to selectively raise either or both film advance pawls 61and 63 so that they do not engage pawl pin 85.

The photographic copying apparatus, in conjunction with which thepresent invention is disclosed herein, includes means for sensing thewidth of the areas on the documents to be photographed. Such a sensingmeans, which does not form a part of the present invention, is disclosedin Hintz et al. US. Patent 2,794,364, granted June 4, 1957. The sensingmeans of the apparatus herein disclosed is operatively associated withpawl selector solenoids 87 and 89 so that pawl selector arms 95 and 97function as follows:

When documents bearing designating means indicating a single width areato be photographed are sensed by the sensing means, neither solenoid isenergized with the result that film advance pawl 61 limits the extent ofthe counterclockwise movement of arm '79 and after exposure of the areaimage on film F, draws arm 79 in a clockwise direction a distance whichis sufficient to advance a length of film F through the exposure stationwhich length is approximately equal to the exposed length of film.

When documents bearing designating means indicating a double width areato be photographed are sensed by the sensing means, solenoid 87 isenergized and pawl 61 is raised from pawl pin 85. Pawl 63 then limitsthe extent of the counterclockwise movement of arm 79 and after exposureof the double width area image on the fihn F, pawl 63 draws arm 79 in aclockwise direction a distance which is sufficient to advance a lengthof film through the exposure station which length is approximately equalto the exposed length of film.

When documents bearing designating means indicating a triple width areato be photographed are sensed by the sensing means, solenoids 87 and 89are both energized raising pawls 61 and 63 from pin 85. Pawl 65 thenlimits the extent of the counterclockwise movements of arm 79 and afterexposure of the triple width area image on the film F, pawl 65 draws arm79 in a clockwise direction a distance which is suflicient to advance alength of film through the exposure station, which length isapproximately equal to the exposed length of film.

From the above it will be apparent that the geometric arrangement of thecranks, pawl arms and film advance pawls is such that the extent ofmovement imparted to film F through arm 79 is dependent upon the filmadvance pawl which remains in engagement with pin 85. In addition, theextent of such movement as imparted by any given film advance pawl, ichanged upon changing the pivot shaft (35) position relative to the pawlarms 27, 29, and 31.

It is to be understood that the novel concept embodied in the filmadvance mechanism of the present invention can be utilized inphotographic apparatus other than the document copying apparatusdescribed herein. For example, in an apparatus which is designed to copya predetermined area only of successive documents only one crank, onepawl arm, and one pawl would be required. Furthermore, the extent ofmovement imparted to the film in such a case could be controlled byvarying (1) the location on the pawl arm at which the pawl is connected,(2) the location on the pawl arm at which the crank is connected, or (3)the location of the pivot axis of the pawl arm or (4) a combination ofany of two or more of these locations on the pawl arm, rather thanmerely varying the location of the pivot axis as shown and particularlydescribed herein. In other words, considering the pawl arm as a lever,the output displacement of such lever, which is used to control theextent of film movement, can be varied without changing the inputdisplacement by changing either the location of the output displacementon the lever, the location of the input displacement imparted to thelever, the location of the fulcrum for the lever, or the location of anytwo or more of the input displacement, output displacement and fulcrum.

A small cam 117 is fixed on a circular plate 118 which is itself carriedby the film advance arm 79. Aperture control arm 119 is maintained incontact with cam 117 by means of a tension spring 120 and is fixed onone end to a shaft 121. Shaft 121 also carries the movable element 123of the mask, see FIG. 4', for the exposure station of the apparatus. Theother element 125 of the mask is fixed in position in the apparatus. Theposition of cam 117 relative to arm 79 can be adjusted by locating theaperture plate adjusting arm 127 by the aperture adjusting screw 129,said arm 127 being fixed on plate 118. Thus the width of the mask isunder the positive control of the film advancing mechanism. With thearrangement there can be no errors because of a synchronizing failure.

Next, the optical system of the present invention, as it is incorporatedin the photographic copying apparatus, will be described. Referring toFIG. 3, the film F is shown in contact with the periphery of the filmdrive roller 83 and the area of the film on which the image of thedocument D is exposed, is designated by the letter E standing forexposure station. The area of document D which is to be recorded islocated over an aperture P formed in the shelf 141, the character Pstanding for the photographing station. The numeral 143 designate aspring which is utilized to keep the document D flat on shelf 141 overaperture P. The card support roller 145 is rotated in synchronism withthe movement of documents into the photographing station so as tosupport the leading edge of the document as it traverses the aperture inthe shelf 141'. Thus roller 145 prevents the cards from falling downinto the aperture P. A lamp 147 is flashed in synchronism with thearrival of each document in the photographing station where the image ofthe predetermined area on each illuminated document is directed to thefirst mirror 151, from the first mirror through the projection lens 153to the second mirror 155, and from the second mirror onto the unexposedarea of the film F then in the exposure station E. The specificmechanism by which the lamp 147 is flashed and card support roller isrotated in synchronism with the movement of each document into thephotographing station, is well known in the art and therefore will notbe described in further detail herein. The shield and reflector 157directs the light from flash lamp 147 onto the documentD in aperture Pin the well-known manner.

In order :to photograph the area on the document D at any one of severalpossible magnifications, a novel system of coordinated mirror and lensmovements has been devised. The optical system in the position shown bythe solid lines in FIG. 3 projects an image of minimum size (for thesystem) to the exposure station E. When the optical elements are shiftedto the positions designated by the dotted representations thereof inFIG. 3, the image projected by the system to the exposure station E hasa maximum size. The image projected to the exposure station E ismaintained in focus at all magnifications.

In FIG. 4, the elements of the optical system, that is, first mirror 151projection lens 153 and second mirror 155 are shown in positionscorresponding to the solid line schematic representation of the same inFIG. 3. First mirror 151 is carried by mirror support 159 which, inturn, is pivotally mounted by means of a shaft 161 on the lower end of atelescoping lens carriage mechanism. The inner telescoping lens carriageshaft on the right within the apparatus is designated by the numeral 163and the outer larger shaft within which shaft 163 telescopes isdesignated by the numeral 165. In order to facilitate the description ofthe apparatus, the structure on the left within the apparatus whichcorresponds to a similar named part on the right will be designated bythe same numeral primed. Thus, for example, the telescoping lenscarriage shaft on the left within the apparatus is designated by thenumeral 163' and the larger shaft 165', see FIGS. 6 and 8.

The numeral 171 and 171 designate follower rollers which are mounted forrotation on the ends of the shaft 161 and engage the focal length cams173 and 173'. Cams 173 and 173' control the telescoping movement of theshafts 163 and 163 in shafts 165 and 165 as first mirror 151 is movedtoward or away from the aperture P of the photo-graphing station. Thenumeral 175 designates a bracket which is fixed relative to mirrorsupport 159 and carries a follower roller 177' for engaging the firstmirror cam 179. The function of mirror cam 179 is to rotate mirror 151about the axis of shaft 161 so that the mirror is maintained in properangular relation to the photographing station to reflect the image of anilluminated document therein through the projection lens 153 regardlessof the position of the mirror as it moves up or down in the apparatus.Lens 153 is mounted for sliding movement along shafts 165 and 165' bymeans of the lens carriage 181 which supports lens 153 and the bushings183 and 183. Brushing 183 carries the magnification cam follower 185.The follower roller 187 on fol lower 18'5 engages in the same slot ofmagnification cam 189. The effect of the magnification cam is to movelens 153 along the shafts 165 and 165' towards and away from mirror 151as the mirror is moved up and down, respectively, in the apparatus.Bushing 183 also carries second mirror cam 191, the function of whichwill be hereinafter described. Second mirror 155 is mounted on mirrorsupport 193 which is pivotally mounted by means of a shaft 195 to theupper shaft bracket 197 and the shafts 1 65 and 165. Shaft 195 carriesfollower rollers 211 and 211' on the opposite ends thereof, to engagethe slots provided in side plates 213 and 213'. Mirror adjusting bracket215 is freely rotatable about shaft 195 and is attached to mirrorsupport 193. Thus the angular position of mirror 155 can be adjusted bymeans of the vertical adjustment screw 217. The second mirror camfollower 219 is mounted for rotation about a hub 220 formed on themirror support 193 and the follower roller 221 on follower 219 movesalong the surface of cam 191 to thereby effect a rotation of secondmirror 155 through the engagement of screw 217 in follower 219. withbracket 215 as the projection lens 153 changes its position relative tothe second mirror. A spring 223, which is connected between follower 219and mirror adjusting bracket 215, holds the mirror adjusting bracket inengagement with the vertical adjustment screw 217. The side plates 213and 213 are mounted to the frame 10 of the apparatus and are connectedby a supporting tie bar 2215. The carriagereturn springs 227 only one ofwhich is shown are connected between the frame 10 and the second mirrorshaft bracket 197, thereby urging the mirror 155 and the lens,

carriage shafts 165 and 165 towards the drive roller 83. Two focallength adjustment cams 231 and 231' are also mounted in the apparatus toframe 10. The follower rollers 233 and 233 which are rotatably carriedadjacent to the end of shafts 165 and 165' on rings 234 and 234' engagethe cams 231 and 231' and thereby control the posiassess? 7 tion ofsecond mirror 155 relative to the side plates 213 and 213.

The mechanism for moving the elements of the optical system along thepath which is determined by the various cams will now be described. Ayoke 235 is pivotally carried by shaft 161 and is attached on the otherend to a screw 237. Screw 237 is threaded in nut 239 which, in turn, isthreaded onto a bushing 241, see FIG. 5. Bushing 241 is retained withinthe housing 242, a portion of frame 10, by means of nut 243 and lockwasher 245. Bushing 2 11 is rotatably supported in the housing by a ballbearing 24-7. A worm gear 249 is fixed on the outer periphery of bushing241 and this gear mates with worm 251 which is carried on a shaft 253driven by electric motor 255 through a belt 257 and pulley 259. Thus itwill be seen that rotation of the worm gear 249 by the motor 255 causesthe screw 237 to be moved relative to nut 239, thereby raising orlowering the first mirror 151 and the other optical elements within theapparatus, depending upon the direction of rotation of the motor. Thecam surfaces which control the position of the optical elements of theoptical system described above are selected to maintain in focus theimage of the document which is projected to the exposure stationregardless of the magnification of such image which can be varied withinpredetermined limits thereby. The electric power to the motor 255 andthe direction which that motor drives belt 257 is controlled byconventional electrical circuitry and switches, not shown, provided in aconvenient location in the apparatus. The portion of the apparatus whichis shown in FIG. 3 is enclosed within a suitable housing so that lightfrom the environs cannot expose or fog the photosensitive film F as itis moved through the exposure station E.

In order to further facilitate the understanding of the invention, adescription will now be provided of the movements of the opticalelements of the optical system when the magnification thereof isincreased. First, the switch in the electrical power circuit for motor255 is closed so that motor 255 drives screw 237 in a direction whichraises yoke 235 within the apparatus. The angular relation of mirror 151to the photographing station is changed by the cams 179, i.e., mirror151 is rotated in a clockwise direction, as viewed in FIG. 4, about theaxis of shaft 161 as the mirror is raised toward the photographingstation. The mirror 151 is moved relative to projection lens 153 as aresult of telescoping movements of shafts 163 and 163' into shafts 165and 165', respectively, caused by cam 173 and 173 acting on the mirrorthrough rollers 171 and 171. Lens 153 is moved along shafts 165 and 165toward first mirror 151 through the action of mag nification cam 189,roller 187, and follower 185. Second mirror 155 moves away from lens 153as a result of rollers 233 and 233' engaging the focal length adjustmentcams 231 and 231' which pushes rollers 211 and 211 down the slot in theside plates 213 and 213'. Movement of mir- I01 155 relative to lens 153causes the mirror to be rorated about the axis of shaft 195 as a resultof the action of roller 221 moving along second mirror cam 191. The neteffect of these movements, all of which occur substantiallysimultaneously and in synchronism, is to increase the size of theprojected image in the photographing station while shortening theoverall length of the projected image path while maintaining theprojected image in focus in the exposure station E. The movements whichoccur during reducing the magnification of the system are a reversal ofthose just described and therefore such a further description thereof isnot included herein.

In view of the foregoing description it will be readily apparent to oneskilled in the art that we have disclosed an improved mechanism forcontrolling the advance of film so that an unexposed section thereof ispositioned to receive the projected images of successive documents, thatwe have disclosed a novel mechanism for adjusting the size of theexposure aperture in the exposure station to conform to the extent ofmovement which is imparted to the film by the film advancing mechanism,and that an improved mechanism is disclosed for simplifying the changingof the optical magnification of the optical system in sucn aphotographic copying apparatus.

The invention has been described in detail with particular reference topreferred embodiments thereof, but it will be understood that variationsand modifications of the invention can be effected within the spirit andscope of the invention as described hereinabove and as defined in theappended claims.

Having now particularly described our invention what we desire to secureby Letters Patent of the United States and what we claim is:

1. An optical system for use in an apparatus for projecting documentimages from the apparatus recording station, in which documents aresuccessively received, onto a recording media located in the exposurestation of the apparatus, said system comprising:

(1) a first reflector disposed to receive images of the documents whenin said recording station,

(2) a projection lens positioned to transmit the document imagesreflected by said first reflector,

(3) second reflector disposed to reflect the document images transmittedby said projection lens to the recording media in said exposure station,and

(4) carriage means operatively associated with said first and secondreflectors and with said projection lens including:

(a) means for varying the distance from and angular relationship of saidfirst reflector to the recording station,

(b) means for changing the position of said projection lens along theoptical axis of said system,

(c) means for varying the spacing of said reflectors along the opticalaxis of said system and the angular position of said second reflectorwith respect to said exposure station,

whereby said reflectors and said projection lens can be synchronouslymoved so as to change the size of the image projected to said exposurestation while maintaining such image in focus on said recording media.

2. An optical system for use in an apparatus for projecting documentimages from the apparatus recording station, in which documents aresuccessively received, onto a recording media located in the exposurestation of the apparatus, said system comprising:

(1) a first reflector disposed to receive images of the documents whenin said recording station,

(2) a projection lens positioned to transmit the document imagesreflected by said first reflector,

(3) a second reflector disposed to reflect the document imagestransmitted by said projection lens to the recording media in saidexposure station, and

(4) carriage means operatively associated with said first and secondreflectors and with said projection lens for synchronously shifting eachof said reflectors and said projection lens with respect to therecording station so as to change the size of the image projected tosaid exposure station while maintaining such image in focus on saidrecording media including:

(a) two spaced parallel shafts,

(b) means mounting said first reflector between said spaced shaftsadjacent to one end thereof for pivotal movement with respect to thespaced shafts,

(0) means mounting said projection lens between said spaced shafts forsliding movement parallel to the shafts,

(d) two small shafts telescopically received by said tWo spaced shafts,respectively, in the end of the p ced shafts remote from said one end,

9 10 (e) means mounting said second mirror between References Cited bythe Examiner said small shafts for pivotal movement with re- UNITEDSTATES PATENTS spect to the small shafts, and (f) cam means fordetermining the positions of 2,940,358 6/1960 Rosenthal 88*24 said firstreflector, said second reflector, and said 5 projection lens in responseto the shifting move- NORTON ANSHER i ments imparted to said carriagemeans. R. A. WINTERCORN, Assistant Examiner.

1. AN OPTICAL SYSTEM FOR USE IN AN APPARATUS FOR PROJECTING DOCUMENT IMAGES FROM THE APPARATUS RECORDING STATION, IN WHICH DOCUMENTS ARE SUCESSIVELY RECEIVED, ONTO A RECORDING MEDIA LOCATED IN THE EXPOSURE STATION OF THE APPARATUS, SAID SYSTEM COMPRISING: (1) A FIRST REFLECTOR DISPOSED TO RECEIVE IMAGES OF THE DOCUMENTS WHEN IN SAID RECORDING STATION, (2) A PROJECTION LENS POSITIONED TO TRANSMIT THE DOCUMENT IMAGES REFLECTED BY SAID FIRST REFLECTOR, (3) A SECOND REFLECTOR DISPOSED TO REFLECT THE DOCUMENT IMAGES TRANSMITTED BY SAID PROJECTION LENS TO THE RECORDING MEDIA IN SAID EXPOSURE STATION, AND (4) CARRIAGE MEANS OPERATIVELY ASSOCIATED WITH SAID FIRST AND SECOND REFLECTORS AND WITH SAID PROJECTION LENS INCLUDING: (A) MEANS FOR VARYING THE DISTANCE FROM AND ANGULAR RELATIONSHIP OF SAID FIRST REFLECTOR TO THE RECORDING STATION, (B) MEANS FOR CHANGING THE POSITION OF SAID PROJECTION LENS ALONG THE OPTICAL AXIS OF SAID SYSTEM, 